Hi Chris, GnuGk usually works very well with H.323 devices from all vendors. There is a list of products people have tried at http://www.gnugk.org/interoperability.html GnuGk supports H.460.18/.19 NAT traversal like the Expressway, so it should be able to get your internet calls through your firewall just fine. Regards, Jan -- Jan Willamowius, Founder of the GNU Gatekeeper Project EMail : jan@xxxxxxxxxxxxxx Website: http://www.gnugk.org Support: http://www.willamowius.com/gnugk-support.html Relaxed Communications GmbH Frahmredder 91 22393 Hamburg Geschäftsführer: Jan Willamowius HRB 125261 (Amtsgericht Hamburg) USt-IdNr: DE286003584 Chris Partsenidis wrote: > Hi people, > > > > I'm new to video conferencing and examining the infrastructure required to > successfully be able to create and receive video conference calls from other > parties. > > > > More specifically, I'm working on a Cisco SX20 Telepresence system which > apparently requires Cisco ExpressWay servers (Cisco's Gatekeepers) in order > to receive and make video conference calls to third parties. > > > > Since we haven't got this infrastructure I was wondering if I could replace > it with the GnuGk software and register the SX20 to it, making it possible > to receive video conference calls from external parties. > > > > Obviously SIP is not supported by GnuGk, so it would have to be H323 clients > e.g Polycom RealPresence Desktop. > > > > Has anyone been able to set this up successfully? As an alternative, are > there any public GateKeepers available as a subscription service? > > > > The goal is to connect the Cisco SX20 with some type of server/service and > allow it to successfully make and receive Video conference calls with the > Internet. > > > > Many thanks in advance. > > > > Chris. > > > > _______________________ > > Chris Partsenidis > > Founder & Editor-in-Chief > > <http://www.firewall.cx/> http://www.Firewall.cx > > Follow Us: <http://www.linkedin.com/groups?gid=1037867> Linkedin, > <http://twitter.com/firewallcx> Twitter, > <http://www.facebook.com/groups/29042864367/> Facebook ------------------------------------------------------------------------------ Flow-based real-time traffic analytics software. Cisco certified tool. Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer Customize your own dashboards, set traffic alerts and generate reports. Network behavioral analysis & security monitoring. All-in-one tool. http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk _______________________________________________________ Posting: mailto:Openh323gk-users@xxxxxxxxxxxxxxxxxxxxx Archive: http://sourceforge.net/mailarchive/forum.php?forum_name=openh323gk-users Unsubscribe: http://lists.sourceforge.net/lists/listinfo/openh323gk-users Homepage: http://www.gnugk.org/